Ejector mechanism for cutting cylinders



March 20, 1951 w. L. HART 255469069 EJECTOR MECHANISM FOR CUTTING CLINDERS Filed April 28, 1948 2 Sheets-Sheet 31 March 20, 1951 w. L. HART 2,546,069

EJECTOR MECHANISM FOR CUTTING CYLINDERS Filed April 28, 1948 2 Sheets-Sheet 2 Patented Mar. 20, 1951 EJECTOB. MECHANISM FOR CUTTING CYLINDERS l Wallace L. Hart, Chicago,

, Machinery Mfg. Company,

poration of Illinois 111., assignor to Roofing Chicago, 111., a cor- Application Ap ril 28, 1948, Serial No. 23,745

2 Claims.

This invention relates to improvements in ejector mechanisms for cutting cylinders of the type commonly employed in the manufacture of roofing strips.

In manufacturing roofing strips of the type slotted along one edge at spaced intervals to form tabs adapted to simulate shingles when the roofing strips are laid in courses upon a roof, relatively long sheets of felt or other fibrous material is saturated with asphalt or other bituminous material and then directed between a cutting cylinder and an anvil cylinder to form transversely extending cut-out slots and also to cut the sheet material longitudinally to form a plurality of shingle strips. In forming-the transversely extending cut-out slots, the cut-out blanks are pressed inwardly within the confines of the cut-out knife and must be ejected prior to subsequent cut-out operations of the knife.

While various types of ejector mechanisms have heretofore been provided for use in ejecting cut-out portions from the knives employed in slotting sheet roofing material, it is an object of the present invention to provide an ejector mechanism which is relatively simple and inexpensive in construction and which will not readily get out of order.

This invention further contemplates the provision of an ejector mechanism in which a plurality of ejector plungers are radially disposed within bearing apertures provided on the cutting cylinder, the inner ends of the ejector plungers being engaged by a collector ring which is mounted upon a shaft having its axis offset from the axis of the cutting cylmder. During rotational movement of the cutting cylinder, the ejector plungers are forced outwardly and then inwardly through the bores provided in the cuttin cylinder to eject blanks of roofing material from between the cut-out knives.

This invention further contemplates the provision of a collector ring formed in two parts which are held in operative engagement against opposite sides of the ejector plungers by means of compression springs. To remove or replace the ejector plungers from the cylinder, it is only necessary to spread the collector rings against the resistance offered by the compression springs.

This invention embodies other novel features, details of construction and arrangement of parts which are hereinafter set forth in the specification and claims, and illustrated in the accompanying drawings, wherein:

Fig. 1 is a plan view showing one end of a cut- 2 ting cylinder provided with an ejector mechanism embodying features of this invention.

Fig. 2 is a transverse fragmentary sectional view taken along the line 2--2 of Fig. 1.

Fig. 3 is a fragmentary longitudinal sectional view taken along the line 3-3 of Fig. 1.

Referring now to the drawings for a better understanding of this invention, the ejector mechanism is shown as applied to a cutting roll 6 of the type commonly employedin cutting asphalt shingles from flexible strip material 1, the cutting roll being provided with the usual slot-forming knives 8, circumferential'knives 9, and longitudinal knives II to coact with an anvil roll l2 in cutting shingles from the strip mate'- rial. The cutting roll 6 and anvil roll H are journaled for rotational movement in suitable bearings and driven by any suitable means.

Each slot-forming knife 8 comprises several blades l3 which are secured to spacing blocks M by means of cap screws I6, the spacing blocks being secured in a recess l1, formed in the periphery of the cutting roll, by means of cap screws l8. During rotational movement of the cutting roll 6, the slot-forming knives 8 cut blanks from the strip material I to form the tab portions of the asphalt shingles. It will be apparent that the blanks thus cut from the strip I become wedged in position between the blades l33and should'be removed prior to subsequent cutting operations.

The, ejector mechanism for removing the cutout blanks from between the blades 13 of the cut-out knives 8 is shown as comprising a plurality of plungers l9 mounted for reciprocable movement in radially disposed bearing apertures 2| formed in the cutting roll 6. It is contem plated that one or more plungers l9 may be provided to eject a blank from between the blades l3 of each knife 8, depending upon the length of the cut-out knife. As illustrated in the drawings, a pair of plungers l9 may be associated with each slot-forming knife 8, the outer ends of the plungers being detachably connected to aknockout bar 22 by means of cap screw's23." If desired, each plunger l9 may be provided witha knockout bar welded or otherwise secured to its outer end.

The inner ends of the plungers 19 are flattened at 24 and provided with crosspins 26 for engagement in annular grooves 21 and 28 formed in opposing faces of a pair of collector rings 29 and 3 l, respectively.

A plurality of pin receiving apertures 32 are formed in the collector rings 29 and 3| to receive connecting pins 33. Retainer rings 3@ are secured to opposite ends of each of the pins 33 to hold the collector rings 29 and 3| in assembled relation. To yieldably resist movement of the collector rings 29 and 3| away from each other, compression springs 36 are mounted on the ends of the pins 33, the collector rings being normally disposed in predetermined spaced. relation by means oiispacing tubes 3-1 mounted upon the pins 33.

The collector rings 29 and SI are formed with. bearing apertures 38 to receive a shaft 39 having its axis 4| offset from the axis'42 of the cutting roll 6. The outer ends of the shaft 39 are journaled in suitable bearingsarranged to hold. the shaft in eccentric relation with respectto the cutting roll.

In the operation of the ejector mechanism in ejecting blanks from between the blades [3 of the slot-forming knives 8, it will be notedthat the collector rings 29 and 3| serve to hold the plungers I9- against. radial movement with respect to: the; shaft 39'. During rotational movementor. the cutting roll a, the knock-out bars are disposed inwardly from the cutting edges of the:.-bla-d:es l3 of the slot-forming knives 8 when the latter are disposed in cutting engagement against the anvilsroll 12. As each slot-forming knife 8 moves out :ofcutting engagement with the anvil roll; the knocks-out bar associated therewith is caused to approach thecutting. edges of the blades l3, thus'ejecting a blank of material outwardly from between the.- blades.

It-isi'an: important feature: of the present inventiorr-to provide an ejector mechanism in which theseveral parts.- are. arranged andcontrolled to provide minimum wear and resultant long life. In other forms-of ejector mechanism, it has been common practice to employ earn surfaces, compressionssprings and other means for imparting 'reciprocablemovement to the plungers. It has been learned-that cam, surfaces are subject to severewear; the compression springs are subject to breakage-and further that it is difiicult to provide a suitable number of ejector plungers .within'a limitedspace by employing such cam surfaces. and compression springs; It will be notedsthatv the present construction permits the use of a relatively large number of ejector plungers disposed either radially or longitudinally along a cutting roll.

A further important feature-of the presentinvention. resides in the provision of an ejector mechanism in which the several plungers may readily be mounted upon or removed. from the cuttingcylinder-G. This is. accomplished-by merely spreading the collector rings 29 and 3| to permit the ends of the pins- 26- to be disengaged from the/grooves 21-. and 2-8 By first removing the block I 4:- and slot-forming knife 8' from, thecutting roll, it will be noted that the plungers I!) may beirotated 90 about their longitudinal axis tOfCZtllSei spreading of the collector rings 29 and. 3t; after; which the plunger l9 may be withdrawn its bearing aperture 2| While thisinvention has: been shownrin but one form, it is obvious to those skilled in the art that it is not so limited but is susceptible of var ious changes and modifications without departing from the spirit and scope of the claimed invention.

I claim as my invention:

1. In; an apparatus of the. character described,

a cutting roll formed with intersecting axial and radial bores, an anchor shaft eccentrically positioned within the axial bore of the cutting roll, a. plunger having. a cylindrical body portion slidably'mounted within the radial bore of the cutting roll, a collector ring concentrically journalecl onsaidranchor shaft, said collector ring comprising two collars formed with opposing concentric annular'recesses and with pin receiving apertures,.a cross pin provided on the inner end of said plunger and engaged within said annular recesses, connecting pins slidably mounted in said apertures, and compression springs mounted on said-connecting pins to yieldably resist parting movement of'said collars responsive to rotation of-said. plunger. about its longitudinal axis.

2. In an apparatus of the character described, cutting roll. i'ournaled for rotational movement andformed with i-ntersectingtaxial and radially disposed bores, aislot-forming. knife provided on the periphery'ofsaid rollat the outerend. of said radialbore, a plunger having a. cylindrical body portion slidably mounted, within said radial bore formovement relative to said knife, the inner end of .said plungertbody being cut away on diametrically: opposed sides to provide a: relatively thin tongue, a crosszpin mounted transversely onv and .havingits; ends projecting. from opposite sides of said tongue, .the: length of said cross pin beinglessthan the diameter of said plunger and disposed topermit. the plunger and cross pin. to be withdrawn as a unit from said'radiall bore, an anchor shaft eccentrically positionedwithin' the axial bore of said roll, a collector ring concentrically 'journaled on said anchor shaft, said collector ring comprising two collars: formed with opposing concentricannular recesses-to receive the ends of said cross pin, said collars being formed with apertures to slidably receive a plurality of connecting pins disposed parallel to said cross .pin, and compression springs mounted on said. connecting pins to yieldably resist parting movement of said collars responsive to rotation of said plunger about, its longitudinal axis.

WALLACE L. HART.

REFERENCES CITED The following. references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,342,343 Montgomery June 1, 1920' 2,088,118 Schillo July 27; 1937 FOREIGN PATENTS Number Country- Date 269,717 Germany July-6 1913 

